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    SubjectRe: [PATCH -v2] rmap: make anon_vma_prepare link in all the anon_vmas of a mergeable VMA
    From: Linus Torvalds <torvalds@linux-foundation.org>
    Date: Sat, Apr 10, 2010 at 02:30:49PM -0700

    > On Sat, 10 Apr 2010, Borislav Petkov wrote:
    > >
    > > Damn, nope, still no joy :(. It looked like it was fixed but one of the
    > > test was to hibernate right after the 3 kvm guests were shut down and I
    > > guess the mem freeing pattern kinda hits it where it most hurts.
    >
    > Damn, I really hoped that was it. Three independent bugs found and fixed,
    > and still no joy? Oh well.

    Yep, I'll redo the testing tomorrow, so that we are sure that even with
    the _three_ bugs fixed we still hit the funky list element issue.

    > > By the way, do we want to create a new thread - the mailchain is off the
    > > screen limits of my netbook :)
    >
    > I prefer to keep it in one thread so that they all show up together if I
    > need to, but feel free to start a new one. Not a biggie.

    I'll keep the thread then - I didn't know it mattered. Mine was just a
    suggestion, nevermind.

    > > [ 647.492781] BUG: unable to handle kernel NULL pointer dereference at (null)
    > > [ 647.493001] IP: [<ffffffff810c60a0>] page_referenced+0xee/0x1dc
    >
    > Well, it sure is consistent. I'll start to think about what else could go
    > wrong..

    Which could mean that even with those issues fixed, the real issue is
    yet something else. Because obviously the fixes you throw at it don't
    seem to change it - even the traces remain consistent across tests.
    And if it is use-after-free case, the funny patterns could be some
    shifted SLUB poison values which we happen to "see" through the dangling
    pointer... I dunno.

    Hmm.

    --
    Regards/Gruss,
    Boris.


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